感谢@Chinchan Zu 的评论,我将一些答案结合在一起来解决这个问题
这是如何将核心 NFC 标记为可选的stackoverflow 问题
首先,您在“Linked Frameworks and Libraries”中将 NFCCore 导入为可选,如此屏幕截图所示
然后在你的代码中,你用这个#if 检查来包装你的代码。这是我使用的课程
#if canImport(CoreNFC)
import Foundation
import CoreNFC
#endif
class NFCManagar: NSObject {
#if canImport(CoreNFC)
var session: NFCNDEFReaderSession?
#endif
var items = [Item]()
var completion: ((_ success: Bool, _ error: Error?)-> Void)?
func beginScanning(items: [Item], completion: @escaping (_ success: Bool, _ error: Error?)-> Void) {
self.completion = completion
self.items.removeAll()
self.items.append(contentsOf: items)
#if canImport(CoreNFC)
session = NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: true)
session?.alertMessage = "Hold your iPhone near check in/out device."
session?.begin()
#endif
}
}
#if canImport(CoreNFC)
extension NFCManagar: NFCNDEFReaderSessionDelegate {
// MARK: - NFCNDEFReaderSessionDelegate
/// - Tag: processingTagData
func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
debugPrint("Nfc is detected")
}
/// - Tag: endScanning
func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
// Check the invalidation reason from the returned error.
if let readerError = error as? NFCReaderError {
// Show an alert when the invalidation reason is not because of a success read
// during a single tag read mode, or user canceled a multi-tag read mode session
// from the UI or programmatically using the invalidate method call.
if (readerError.code != .readerSessionInvalidationErrorFirstNDEFTagRead)
&& (readerError.code != .readerSessionInvalidationErrorUserCanceled) {
debugPrint("Nfc didInvalidateWithError \(error)")
}
}
// A new session instance is required to read new tags.
self.session = nil
}
}
#endif